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Results of structural neutron diffraction study, magnetization and ESRmeasure-ments are presented for insulating Nd0.75Ba0.25MnO3, Tc = 129 K. Thecrystal structure is refined in the range 4.2-300 K. The compound is found toexhibit the Jahn-Teller (JT) transition at 250 K. The field cooled (FC)magnetization data are in a reasonable agreement with the predictions for a 3Disotropic ferromagnet above Tc. However, these measurements reveal a differencebetween the FC and zero FC data in the paramagnetic region. ESR results arealso in a correspondence with behavior of a cubic ferromagnet above T* = 143 K.It is shown that an anisotropic exchange coupling of the Mn and Nd magneticmoments can give a substantial contribution in ESR linewidth masking itscritical enhan-cement. The different temperature treatments of the samplereveal a temperature hysteresis of the ESR spectra below T* indicating ananomalous response in the paramagnetic region. The study of phase transition inthis manganite suggests change in its character from the second to first orderat T*. The conventional free energy including the magnetization and magneticfield is not found to describe the first order transition. This suggests thatthe charge, orbital and JT phonon degrees of freedom, in addition tomagnetization, may be the critical variables, the unusual character of thetransition being determined by their coupling. Unconventional critical behavioris attributed to orbital liquid metallic phase that coexists with the initialorbital ordered phase below T*.Comment: 18 pages, 5 figures, submitted to Phys. Rev.

physical review. b, condensed matter and materials physics

Neutron diffraction, magnetization, and ESR studies of pseudocubic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Nd</mml:mi><mml:mn>0.75</mml:mn></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mn>0.25</mml:mn></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>and its critical behavior above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><…

Neutron diffraction, magnetization, and ESR studies of pseudocubicNd0.75Ba0.25MnO3and its critical behavior aboveT<…